ci.yml in vultr-2.0.0

- old
+ new

@@ -10,20 +10,26 @@
 jobs:
   tests:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        ruby: ["2.4", "2.5", "2.6", "2.7", "3.0"]
+        ruby: ["3.0", "3.1", "3.2", "3.3"]
+        gemfile: ["faraday_1", "faraday_2"]
 
+    env:
+      BUNDLE_GEMFILE: ${{ github.workspace }}/gemfiles/${{ matrix.gemfile }}.gemfile
+      BUNDLE_PATH_RELATIVE_TO_CWD: true
+
     steps:
       - uses: actions/checkout@master
 
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1
         with:
           ruby-version: ${{ matrix.ruby }}
           bundler: default
           bundler-cache: true
+          rubygems: latest
 
       - name: StandardRb check
         run: bundle exec standardrb
 
       - name: Run tests